Ratchet and Clank has had a lot og games over the years.  It's first game really sky-rocketed to the top and then the next games pretty much kept all of the same basics but changed the weapons and the story line.  What I felt made the series hit a down point was Ratchet and Clank: Deadlocked beause it got rid of all the old things people loved about Ratchet and Clank. Next, Ratchet and Clank: Size Matters was made on the PSP and had put a lot of the old basics from the origanal game.  Then they came up the PSP game Sectert Agent Clank (it is said that it was meant to be like James Bond) that had you play as Clank most of the game.  Finally, the Rachet and Clank Future series was made.  The First of the future game was tools of destruction which when was made for PS3 did very well and is was of the top played and ranked games at the time, plus the next was called quest for booty did most as the one before except for the fact that clank is gone.  In my personal opinion I like the first Ratchet and Clank and Ratchet and Clank: Tools of Destruction because for the first rachet and clank , it started it all and had a lot of great qualities about and tools of destruction because is reinstated those first thins in ratchet and clank and added new good things that made it great.  Tell me which of the games you perfered put of the series.